Rock drill



Sept. 29, 1936. .1 C;n CURT|$ 2,055,520

ROCK DRILL Filed March ll, 1935 2 Sheets-Sheet l i INVENTOR BY ATTORNEY Sept. 29, 1936. J Q CURT|S 2,055,520

' ROCK DR ILL Filed March ll, 1935 2 Sheets-Sheet 2 ATTORNEY Patented- Sept. 29, 1936 UNITED STATES ROCK DRILL .lohn C. Curtis, Garfield Heights, Ohio, assigner to The Cleveland Rock Drill Company, Cleveland, Ohio, a corporation of Ohio Application March l1,

21 Claims.

This invention relates broadly to rock drills, but more particularly to feeding mechanism for rock drill of the mounted drifter type.`

One object of this invention is to produce an improved feeding mechanism for rock drill of the drifter type.

Another object of this invention is to produce an improved rock drillfeeding mechanism including a power actuated feeding moto-r and connections between the motor and the rock drill whereby thclatter is fed toward or away from the work at a greater rate of speed than that of the power actuated feeding motor, this materially reducing the length of the feeding mechanism without affecting the standard feed length of the rock drill.

Another object ofthis invention is to produce a drill feeding and supporting mechanism including a collapsible drill guiding frame, whereby the overall length thereof may be reduced to substantially one half of the possible feed length ofthe drill."

Another object of this invention is to produce a feeding and supporting mechanism foruse with a rock drill of the standard construction.

Other objects and advantages more or less ancillary to the foregoing and the manner in which the various objects are attained, reside in the specific construction and aggroupment of the elements peculiar to this structure, as will become apparent from a more complete'examination of this specification, in the claims of which there are assembled certain specific combinations of parts and specific constructions' indicative of the scope and spirit of the invention.

Referring to the drawings, in which like symbols designate corresponding parts throughout the several views;

` Fig. 1 is a side elevational view of the assembly mounted on a wheel'supported frame and showing the drill guiding in a collapsed position.

, Fig. 2 isa portion of Fig.V 1 showingthe drill guiding frame in extended position. L i Fig. 3 is a plan View of the assembly shown in Fig. 1.

. Fig. 4 is an enlarged front elevational view of the lower end portion of the assembly shown in Fig. 2.

Fig. 5 is an enlarged longitudinal sectional view of the drill feeding and supporting mechanism Iembodying the present invention.

" Fig. 6 is an enlarged cross sectional view taken in a planeindicated by line 6-6 in Fig. 5.

Fig. 7 is an enlarged top plan View of the upper portion ofthe mechanism shown in Fig. 5.`

1935, serai No. 10,492 (o1. Y12in-9) Fig. 8 is a view similar to Fig. 7 showing the lower portion of the mechanism shown in Fig. 5. Referring to the drawings which illustrate a preferred embodiment of the invention, I9 represents `a wheel supported -frame having a substantially Ushaped member II pivotally secured thereto by means of connections I2. Afxed to the cross arm I3 of the member I I by means'of aclamp I4, there is` a body or housing I5 carrying `a bolt I6 protruding through Vthe clamp I4 for receiving a nut Il by which the housing may be locked relatively to the clamp. The housing I5 isformed with an enlarged counterbore I8 ldisposed at right angles with the bolt I6 and adapted to receive one end, hereinafter denoted as the rear end, of a tube I 9. The other end of the tube, hereinafterdenoted as the-front end has disposed therein a front head or bracket 20. The housing I5 and front head 20 are secured in abutting uid tight engagement with the end of the tube by two ldiametrically disposed side rods 2l each extending through the body I5 to receive a nut 22, while the front end of each rod extends through lugs 23 formed integral with the front head 29. Mounted on that extended portion of each rod, there is a tube` or sleeve 24 clamped between the lug 23 and across head 25 by means of a nut 26 engaging the outer threaded front end portion of the rods. On each of the sleeves 24 is slidably mounted one half portion 21 of a drill steel centralizer which is constantly urged in engagement with the cross head 25 by the Veffort `of a compression spring 28.

Reciprocably mounted within the tube I9, there is a piston 29 havinga pistonrod 39 rigidly secured thereto by a nut 3|. The piston rod 30 isA somewhat longer than the tube "I9 and extends from one side of the piston to the exterior of the tube throughthe body or housing I5. To assure a fluid tight joint about the rod, the housing I5 is providedwith a stuing'box 3,2. Welded on the tube I9 in longitudinal Valignmenttherewith, thereV are two elongated members 33 extending from near the housing I5 toward the front end thereof for a distance substantially equal to two thirds of the length of the tube. These members are formed with guideways 34 extending the full length thereof, and are adapted to slidably receive the guides 35- of a shell 36. The shell proper is formed of an arcuated body portion 3l somewhat longer than the tube I 9. The upper portion of the side walls of the shell are also formed with guideways 38 having slidably mounted therein the corresponding guides 39 of a rockdrill motor 49. The 55 front end of the shell toward the rear end thereof a distance about equal to two thirds the length of the shell. 'I'he rear end of the shell 36 is terminated by an apertured lug or connection 4I adapted to receive the screw threaded end'of the piston rod 39 which is rigidly secured thereto by a nut 42. Near the lug 4I, each of the side walls of the shell is formed with a longitudinal slot Y43 adapted to receive a bolt-like shaft 44 transversely disposed through the shell. Carrying the shaft 44 for longitudinal movement within the slot 43, there is a U-shaped strap 45 passing over the end of the Vshell inA straddle relation therewith. This strap is provided with an adjustment screw 46 engageable with the end wall of the shell, the purpose vof which will be explained later. The shaft is locked against lateral movement by a nut 63 mounted on one end thereof and a head 4I formed integral therewith, the nutand head engaging the strap 45 as shown in Fig. '7. Toward its front end, the shell 36 has a portion of the arcuated'bottom wall thereof cut away to provide an opening 49. Trans- Vversely. disposed through the'side walls Vof the shell adjacent this opening and extending therethrough, there is a shaft 49 parallel to the shaft 44.V This shaft like the shaft 44 is locked against lateral movement by a head 59 and nut 5I engaging the side walls of the shell.

VThe upper wall of the housing I below the shellY 36 is provided with a series of sprocket teeth 52 adapted to receive the middle portion of a chainV 53 which is thereby fastened against longitudinal movement relative to the tube I9. From the housing I5, one half portion of the chainV 53 extends rearwardly over a sprocket Y wheel54 rotatably mounted on the shaft 44, and then forwardly to the cylinder of the drilling motor 49, where it is fastened by a chain connecting member 55 rigidly secured within the usual longitudinally apertured lug 56, depending from the cylinder. The other one Y half portion of the chain 53 extends forwardly from the housing I5, overa sprocket wheel 571 rotatably mounted on thel shaft 49, from where it extends rearwardly to the drilling motor 40 and is connected theretorby the chain connecting member 55.

v Secured to the side of the tube I9 somewhat below the housing I5, there is a valve housing 58 having a motive fluid controlling throttle valve Y(not shown) rotatable therein rby a handle 59.

The valve housing is provided withva connection 60 adapted to receive armotive fluid conveying conduit for admitting motive fluid to the valve.

Since the throttle valve and its appurtenant parts Vform no part of the present invention, no further explanation is thought necessary other than pointing out that the motive fluid controlled by the throttle valve may be admitted in the tube `I9 vthrough a conduit 6I opening therein adjacent-the housing I5, and a conduit 62 opening therein adjacent the front head 29. f

The operation of the mechanism is as follows: When motive fluid is admitted from the throttle valve' in the rear end portion of the tube I9 through the conduit 6|,Vit acts on' the piston 2S and housing I5. Since the latter together with the tube I9 is stationary, the piston is driven forwardly or toward the front head 29, thus causing the forward movement to the shell 36 relative to theY tube I9, due to the piston rod 39 and lug 4I connecting the shell to the piston.

5T engaging the chain 53 will cause the latter guides 35 and guideways 38 extend from theV to transmit forward motion to the drilling motor 49 at a greater rate of speed than that of either the shell or the piston. When the piston 29 is at the end of its forward stroke or about-positioned as shown in Fig. 5, each end of the shell extends only slightly over the corresponding end of the tube III, and the drilling motor 49 extends only slightly over the front end of the shell 36, thus constituting an assembly of a length substantially equal to that of the tube I9.

When it is desired to feed the drilling motor rearwardly or away from the work, the throttle valve may be positioned for admitting motive in Y the front end of the tube I 9 through the conduit 62. In this instance the motive fluid acting on the front face of the piston 29 will drive the latter, together with the shell 36, away from the Work. Since the shell 36 is connected to the drilling motor 40 through the sprocket wheels and the chain 53, the movement of the shell is transmitted to the motor 49 Vat a greater rate of speed than that of the shell 36 or piston 29. When the piston reaches the end of its rearward stroke, the rear end portion of the shell 36 carrying the drilling motor 40 extends well beyond the rear end of the shell, as shown in Fig. 5. In this instance, the front end portion of the guides 35 remaining within the guideways 34 for supporting the shell, are assisted by the piston Vrod 39 protruding from the tube I9.

The'strap 45 carrying the shaft 44 on which the sprocket wheel 54 is rotatably mounted, may be moved relatively to the shell 36 for varying the tension of the chain 53, by simply rotating the adjustment screw 46.

As a result of this present invention it will be noted that since the front eifective area of the piston 29 is larger than the rear effective area, the power of the feeding mechanism imparting feeding'motion to the drilling motor away from the work is greater than that imparting feeding motion thereto toward the work. 'I'his advantageous feature has been found extremely valuable for extracting stuck drill steels from a drilled hole. Itwill further be noted that by the slidable arrangement of the shell on the feed tube, an ex- Ytremely simple and compact mechanism is obtained without affecting the standard length of feed'of the drilling motor.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the 'specific terminology is not intended Yto be restrictive or confining and it is to be further understood that various rearrangements of parts and modification of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. In a drilling apparatus, a shell having a drilling motor slidable thereon, a stationary tube having said shell slidable thereon, a power actuated piston longitudinally movable within said tube associated with said shell for imparting slidable movement thereto, and means deriving motion from the slidable movement of said shell for transmitting feeding motion to said drilling mot'or atV a greater rate of speed than that of said shell.

2. In a drillingapparatus, a shell having a drilling motor slidable thereon, a feeding mechanism fol1 said motor comprising a stationary and a power actuated longitudinally movable element, said shell being connected to the latter for movement4 therewith relative to said Ystationary element, and means deriving motion from the movement of ysaid shell for transmitting feeding motion to said drilling motor at a different rate of speed from that of said shell. l

3. In a drilling apparatus, a stationary elongated element, a shell slidable thereon, a power actuated mechanism associated with said shell for imparting slidable movement thereto, a drilling motor slidable on said shell, and means deriving motion from the movement of said shell for transmitting feeding motion to said drilling motor at a greater rate of speed than that of said shell.

l4. In a drilling apparatus, a slidable shell, a drilling motor slidably guided thereon, a feeding mechanism for vsaid motor comprising a duality ofelements one slidable relatively to the other, said shell being slidably guided on one of said elements and connected to the other for movement therewith, means for effecting the slidable movement of said last mentioned element and consequently of said shell, and means responsive to the slidable movement of said shell for effecting the slidable movement of said motor relative to said shell.

5. VIn a drilling apparatus, a stationary element, a power actuated mechanism within said element,

, a member slidably guided on said element, a drilling motor slidably guided on said member, a connection between said mechanism and member for imparting movement to the latter, and means deriving motion from the slidable movement of said member for effecting relative slidable movement between the latter and said motor.

6. In a drilling apparatus, a duality of elements one guided on the other for slidable movement relative thereto, a drilling motor carried by said guided element for slidable movement relative thereto, a power actuated mechanism associated with the guided element for imparting slidable movement thereto, and means deriving motion from the slidable movement of said guided element for transmitting slidable movement to said motor relative to said guided element.

7. In a drilling apparatus, a supporting element, a member slidably guided on said element, a drilling motor carried by said member for slidable movement relative thereto, a power actuated mechanism associated with said member for imparting slidable movement thereto and means deriving motion from the slidable movement of said member for effecting the slidable relative movement between the latter and said motor.

8. In a drilling apparatus, a mechanism including an elongated tubular element having an elongated member slidably guided thereon, a drilling motor slidably guided on said elongated member, power actuated means within said tubular element connected to said member for imparting slidable movement thereto, and movement transmitting connections between said member and said motor for transmitting slidable movement to the latter relative to the former.

9. In a drilling apparatus, a slidable shell, a drilling motor slidably guided thereon, a feeding mechanism for said motor comprising a stationary cylinder having a power actuated piston slidable therein, said shell being slidably guided on said cylinder and connected to said piston for movement therewith, and speed multiplying connections between said shell and said motor including a flexible element secured to said cylinder and said motor and rotatable members carried by said shell with which said flexible member engages.

10. In a drilling apparatus,a slidable shell, a drilling motor guided thereon, a power actuated feeding mechanism for said motor comprising a stationary and a'movable element,said shell being slidably guided on said stationary element and connected to said Vmovable element for slidable movement therewith, and speed multiplying connections between said shell and said motor includinga flexible member secured to said stationary element and said motor and rotatable members carried by said shell with which said flexible member engages.

11.In a drilling apparatus, a stationary elongated element, a member slidable on said element, a drilling motor slidable on said member, a power actuated mechanism associated with said member for imparting slidable movement thereto, and means associated with said element, said member and said motor for transmitting the slidablemovement of said member to said motor at a rate of speed different from that of said member.

l12. In a drilling apparatus, a stationary elongated element having an elongated member slidable thereon, a drilling motor slidable on said member, power actuated means within said element operatively connected to said member for imparting` slidable movementthereto, and means for transmitting the slidable movement of said member to said motor at a rate of speed diiferent from that of said member.

13. In a drilling apparatus, a slidable shell, a drilling motor slidably guided thereon, a feeding mechanism for said motor comprising a stationary cylinder having a power actuated piston slidable therein, said shell being slidably guided on said cylinder and connected to said piston for movement therewith, and a chain and sprocket wheel connection between said shell and said motor whereby the slidable movement of the former is transmitted tov the latter at a rate of speed different from that of said shell.

14. In a drilling apparatus, a stationary elongated element having an elongated member slidable thereon, a drilling motor carried by said member capable of slidable motion relative thereto, power actuated means within said element operatively associated with said member for imparting slidable movement thereto, and means actuated by virtue of the movement of said member for causing the slidable motion of said motor relative to said member.

15. In a drilling apparatus, a drilling motor, a feeding mechanism therefor including a shell on which said motor is slidably guided, an elongated tubular element having said shell slidably guided thereon, power actuated means within said tubular element associated with said shell for imparting feeding motion thereto, and further means between said shell and said motor for transmitting the feeding motion of the former to the latter at a rate of speed different from that Y of said shell.

16. In a drilling apparatus, a drilling motor, a feeding mechanism therefore including an elongated member having a shell slidable thereon, a movable feeding element associated with said shell for imparting feeding motion thereto', and means including a flexible draft element operatively connecting said shell to said motor for transmitting the feeding motion of the former to the latter at a rate of speed different from that of said shell.

I tion thereto, and connecting meansv between said support and motor deriving motion from said shell Vfor imparting feeding motion to the motor at a gerater rate of speedthan that of said shell.

18. s In a drilling apparatus, the combination with a stationary support, of an elongated element slidable thereon, of a drilling motor slidable on said element, a feeding mechanism for said motor including a piston chamber within said support having a fluid actuated piston slidable therein and rigidly secured to said element for transmitl ting slidable movement thereto relative to saidY housing, and movement transmitting means connected to said support and motorV deriving motion Yfrom the slidable movement of said element for transmitting slidable movement to `said-motor at a greater rate of speed than that of said element.

19. In a drilling apparatus, the combination with a stationary supporting housing, of an elongated element slidablethereon, of a drillingrmotor slidable on said element', a. feeding mechanism for said motor including a power actuated piston slidable within said housing and rigidly connected to said element for effecting relative motion between said element and said housing, and means deriving motion from said relative motion for transmitting motion to said motor in the same direction but at a greater rate of speed than that of the relative motion aforesaid. Y

20. In a drilling apparatus, the combination with a stationary tube having guideways formed thereon, of an ,elongated member slidably guided within said guideways, of drilling motor slidably guided on said member, a. feeding mechanism for said motor including a power actuated piston slidable Within said tube rigidly connected to said member for imparting slidable movement thereto, and a flexible element fastened to said housing and motorand co-operating with rotatable means carried by said member for transmitting the slidable movement of said member to said motor at a greater rate of speed than that of said member.

2i. In a drilling apparatus, the combination with a stationary element having a movable element slidable thereon, a drilling motor slidably guided on said movable element, a power actuated piston slidable within said stationary element rigidly connected to said movable element for imparting slidable movement thereto, and means deriving motion from said movable element for transmitting movement to said drilling motor relative to said movable element. 

